Developing a Model-View-Controller (MVC) Component for Joomla!1.6 - Part 05/ja

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Articles in this series

Introduction

This tutorial is part of the Developing a Model-View-Controller (MVC) Component for Joomla!1.6 tutorial. You are encouraged to read the previous parts of the tutorial before reading this.

Adding a variable request in the menu type

For the moment, the displayed message is always Hello World!. Joomla!1.6 gives the possibility to add parameters to menu types. In our case, this is done in the site/views/helloworld/tmpl/default.xml file:

site/views/helloworld/tmpl/default.xml

<?xml version="1.0" encoding="utf-8"?>
<metadata>
	<layout title="com_helloworld_HelloWorld_View_Default_Title">
		<message>com_helloworld_HelloWorld_View_Default_Desc</message>
	</layout>
	<fields
		group="request"
		array="true"
	>
		<field
			id="id"
			name="id"
			type="list"
			label="com_helloworld_HelloWorld_View_Default_Msg_Label"
			description="com_helloworld_HelloWorld_View_Default_Msg_Desc"
			default="1"
		>
			<option value="1">Hello World!</option>
			<option value="2">Good bye World!</option>
		</field>
	</fields>
</metadata>

Note two important information:

the request group that indicates mandatory fields
the array parameter that indicates that these parameters will be added in the request URL

The model has to be modified in order to choose between the two different messages:

site/models/helloworld.php

<?php
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
// import Joomla modelitem library
jimport('joomla.application.component.modelitem');
// inherit the JModelItem class
class HelloWorldModelHelloWorld extends JModelItem
{
	/**
	 * @var string msg
	 */
	protected $msg;
	/**
	 * Get the message
	 * @return string The message to be displayed to the user
	 */
	public function getMsg() 
	{
		if (!isset($this->msg)) 
		{
			$id = JRequest::getInt('id');
			switch ($id) 
			{
			case 2:
				$this->msg = 'Good bye World!';
			break;
			default:
			case 1:
				$this->msg = 'Hello World!';
			break;
			}
		}
		return $this->msg;
	}
}

Also modify your helloworld.xml file to indicate the new version:

helloworld.xml

<?xml version="1.0" encoding="utf-8"?>
<extension type="component" version="1.6.0" method="upgrade">
	<name>Hello World!</name>
	<creationDate>November 2009</creationDate>
	<author>John Doe</author>
	<authorEmail>john.doe@example.org</authorEmail>
	<authorUrl>http://www.example.org</authorUrl>
	<copyright>Copyright Info</copyright>
	<license>License Info</license>
	<version>0.0.5</version>
	<description>Description of the Hello World component ...</description>
 
	<files folder="site">
		<filename>index.html</filename>
		<filename>helloworld.php</filename>
		<filename>controller.php</filename>
		<folder>views</folder>
		<folder>models</folder>
	</files>
 
	<administration>
		<menu>Hello World!</menu>
		<files folder="admin">
			<filename>index.html</filename>
			<filename>helloworld.php</filename>
		</files>		
	</administration>
</extension>

Packaging the component

Content of your code directory

Create a compressed file of this directory or directly download the archive and install it using the extension manager of Joomla!1.6. You can add a menu item of this component using the menu manager in the backend.

Contributors

Christophe Demko